Aluminized Steel Facts
- Aluminized steel sheet combines the strength of steel
with the advantages of aluminum, and is extensively used
for the parts that need heat resistance; such as
automobile exhaust systems, and appliances.
- Aluminized
steel became commercially available in the 1950's.
Similar to the galvanizing process, aluminum is metallurgically bonded to the steel surface, providing
excellent heat reflectivity and corrosion protection.
- Aluminized Steel (ASTM-A463) is hot-dip coated on both
sides with an aluminum/silicon alloy coating? This steel
has the surface characteristics of aluminum with the
superior strength and lower cost of steel. It is
produced with a soft, satin-like finish.
- Aluminized
steel is manufactured in two grades. Type 1 has a Si-Al
alloy coating and is best suited in an environment where
a combination of heat and corrosion is involved. Type 2
has a pure Al coating and has excellent resistance to
atmospheric corrosion.
- Aluminized steel is carbon steel
with a thin coating of aluminum to resist rust. This is
the same material automobile mufflers and tail pipes are
made of and has a long record of good service in high
temperature applications.
- Aluminized Type 1 resists heat
and oxidation up to 900° F (482° C) without discoloring
and maintains its strength at temperatures up to 1250° F
(677°C).
- Aluminized Type 1 can be a cost effective
alternative to stainless steel since it frequently
maintains its appearance better in service than 409
stainless.
- Aluminized Type 1 has excellent heat
reflectivity during exposures below 900° F (482° C),
reflecting up to 80% of the radiant heat that strikes
it.
- Aluminized has superior performance compared to
galvanized for resistance to atmospheric, salt spray and
muffler condensate corrosion.
- An outstanding example of
how effectively aluminized Type 1 combats the combined
attack of heat and corrosion is the automobile muffler.
On the inside, mufflers are exposed to intense heat, and
on the outside, they are splashed with water, mud and
snow melting chemicals.
- Consumption of aluminized steel
in North America is approximately 700,000 tons.
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